Atopy is a predisposition toward developing certain allergic hypersensitivity reactions. Atopy may have a hereditary component, although contact with the allergen or irritant must occur before the hypersensitivity reaction can develop.
As of 2012, 63.9 percent of players playing in Major League Baseball are white. There is no way of telling the exact number due to the number of players.
In baseball, more than any other sport, numbers matter. Here: 56, .400, 3,000. If you're a serious student of the game, you know what those mean, instinctively, without context or clarification. Now, with MLB's collective bargaining agreement set to expire after the 2016 season, another number is getting attention: 162. For more than 50 years, that's how many games have been crammed into the regular-season schedule. It's a grind, a marathon, a spring-to-autumn endurance test.